172257728 has 28 divisors (see below), whose sum is σ = 350166432. Its totient is φ = 84026880.

The previous prime is 172257727. The next prime is 172257733. The reversal of 172257728 is 827752271.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172257727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30200 + ... + 35447.

It is an arithmetic number, because the mean of its divisors is an integer number (12505944).

Almost surely, 2^172257728 is an apocalyptic number.

It is an amenable number.

172257728 is an abundant number, since it is smaller than the sum of its proper divisors (177908704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172257728 is an equidigital number, since it uses as much as digits as its factorization.

172257728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65700 (or 65690 counting only the distinct ones).

The product of its digits is 109760, while the sum is 41.

The square root of 172257728 is about 13124.6991584569. The cubic root of 172257728 is about 556.4074097627.

The spelling of 172257728 in words is "one hundred seventy-two million, two hundred fifty-seven thousand, seven hundred twenty-eight".